dmaengine: dw: introduce dwc_dostart_first_queued() helper

We have a duplicate code which starts first descriptor in the queue. Let's make
this as a separate helper that can be used in future as well.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 11 insertions, 8 deletions

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index a27ded53ab4f..5ddf5e4c1222 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -279,6 +279,15 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
         channel_set_bit(dw, CH_EN, dwc->mask);
 }
 
+static void dwc_dostart_first_queued(struct dw_dma_chan *dwc)
+{
+        if (list_empty(&dwc->queue))
+                return;
+
+        list_move(dwc->queue.next, &dwc->active_list);
+        dwc_dostart(dwc, dwc_first_active(dwc));
+}
+
 /*----------------------------------------------------------------------*/
 
 static void
@@ -335,10 +344,7 @@ static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc)
          * the completed ones.
          */
         list_splice_init(&dwc->active_list, &list);
-        if (!list_empty(&dwc->queue)) {
-                list_move(dwc->queue.next, &dwc->active_list);
-                dwc_dostart(dwc, dwc_first_active(dwc));
-        }
+        dwc_dostart_first_queued(dwc);
 
         spin_unlock_irqrestore(&dwc->lock, flags);
 
@@ -467,10 +473,7 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
         /* Try to continue after resetting the channel... */
         dwc_chan_disable(dw, dwc);
 
-        if (!list_empty(&dwc->queue)) {
-                list_move(dwc->queue.next, &dwc->active_list);
-                dwc_dostart(dwc, dwc_first_active(dwc));
-        }
+        dwc_dostart_first_queued(dwc);
         spin_unlock_irqrestore(&dwc->lock, flags);
 }